OPAMP recommendation in quad package

[user 37518]

Hi everyone, I need to build a circuit with several opamps and I am looking for opamps in quad configuration. I don't care if its SMD or through hole as long as it is either SOIC or DIP.

I prefer a bipolar opamp but a low noise FET will do, the LME49740 would've been perfect but it is now discontinued. I am looking for opamps similar to an NE5532, LM4562 or OPA1612, the first one that comes to mind is the OPA4134 which is the quad version of the FET OPA134, I would like something with less voltage noise and similar driving capabilities aswell as +/-15V supply capable. I don't need extra wide bandwidth or very high Slew Rate, I prefer an opamp which is unity gain stable and not that picky for layout, any recommendations?


The OPA1679 looks nice https://www.ti.com/lit/ds/symlink/opa1679.pdf?HQS=TI-null-null-mousermode-df-pf-null-wwe&ts=1601526748998&ref_url=https%253A%252F%252Fwww.mouser.mx%252F The price is quite affordable and the specs are almost the same as an NE5532. According to the simplified internal schematic it seems to be a MOS opamp, any experiences with it?

 

[john12ax7]

OPA1644 is worth a look, though I haven't used them yet.

 

[gyraf]

I often really like what the MC33079 does...

/Jakob E.

 

[user 37518]

Both seem like really good options, thank you, the MC33079 is dirt cheap, the OPA1644 is considerably more expensive.

One question about the MC33079, Jakob, can it drive 600 ohm loads without crying? the datasheet says it can supply a good amount of current, but the THD plots are made considering a 2K load, I might not load it with 600ohms but I will certainly do it with 1K. The OPA1644 seems to be able to drive 600 ohm loads with its corresponding increase in distortion, however, its still quite low.

 

[gyraf]

I've driven output transformers with it happily, but have never looked further into what muscles it actually comes with.

/Jakob E.

 

[living sounds]

Also have a look at ad8513

Good part, but the noise performance is not as good as the NE5532. Voltage noise is comparable to the OPAx134 family.

 

[user 37518]

just had a look at 1642 datasheet and was suprised by its excellent lowlevel distortion.
better than opa1612.

Yes but much higher noise, however, for a FET opamp its quite low, seems like a better alternative to the OPAx134 which costs around the same.

 

[Cjuried]

Both seem like really good options, thank you, the MC33079 is dirt cheap, the OPA1644 is considerably more expensive.

One question about the MC33079, Jakob, can it drive 600 ohm loads without crying? the datasheet says it can supply a good amount of current, but the THD plots are made considering a 2K load, I might not load it with 600ohms but I will certainly do it with 1K. The OPA1644 seems to be able to drive 600 ohm loads with its corresponding increase in distortion, however, its still quite low.

The OPA1644 noise is down at 5.1-nV/√Hz. I like em' quiet

 

[Monte McGuire]

The Analog AD713 is still available, even in a DIP package, and it's a nice BiFET quad, basically like a TL074 that's around 10dB better in every way. Less offset, noise, distortion, etc. It's pricey now and probably not worth the bother these days, especially if you can rig up something more modern, but back a long time ago with Neotek consoles (which are full of quad BiFETs) the AD713 was a nice way to retain the basic TL074 character but make everything a little nicer. For that console, which needs DIP parts, SMD adapter boards stuffed with modern dual op amps is probably the right way to go. There are so many fine op amps available now. Still, the 713 is a good way to have something like a TL074 that's just a little bit more refined with all of the same characteristic flaws.

 

[user 37518]

The Analog AD713 is still available, even in a DIP package, and it's a nice BiFET quad, basically like a TL074 that's around 10dB better in every way. Less offset, noise, distortion, etc. It's pricey now and probably not worth the bother these days, especially if you can rig up something more modern, but back a long time ago with Neotek consoles (which are full of quad BiFETs) the AD713 was a nice way to retain the basic TL074 character but make everything a little nicer. For that console, which needs DIP parts, SMD adapter boards stuffed with modern dual op amps is probably the right way to go. There are so many fine op amps available now. Still, the 713 is a good way to have something like a TL074 that's just a little bit more refined with all of the same characteristic flaws.

Jeez, its around $20 USD each.

 

[scott2000]

A few AD713JN here for less. Have had good luck in the past with them....

https://rcfreelance.com/search.php?q=ad713


How many 49740 would you need for your project?

 

[user 37518]

A few AD713JN here for less. Have had good luck in the past with them....

https://rcfreelance.com/search.php?q=ad713


How many 49740 would you need for your project?

Thanks for that link, I'll be needing around 10 of them.

 

[scott2000]

I'll be needing around 10 of them.

This place was brought up here before...The member here was looking for a group buy since there is a minimum of 122. Digikey uses them as one of their Marketplace distributors apparently.......

https://www.rocelec.com/part/tislme49740na-nopb

I have a few, not sure about 10...... could check later if you are still set on using them and haven't gone another direction. Just PM me.

 

[living sounds]

This place was brought up here before...The member here was looking for a group buy since there is a minimum of 122. Digikey uses them as one of their Marketplace distributors apparently.......

https://www.rocelec.com/part/tislme49740na-nopb

I have a few, not sure about 10...... could check later if you are still set on using them and haven't gone another direction. Just PM me.

Paradoxically they also list prices for smaller amounts...

 

[Kingston]

LME49740 would've been perfect but it is now discontinued.

Very unfortunate I was about to recommended it over anything.

I suppose with DIP going away and smaller sizes taking over, quad is not really needed for anything. No price or size savings to be had anymore.

 

[user 37518]

I suppose with DIP going away and smaller sizes taking over, quad is not really needed for anything. No price or size savings to be had anymore.

The biggest benefit of using quad, in my opinion, is that you need less +/- Vcc lines and less coupling capacitors than 2 duals.

 

[abbey road d enfer]

The biggest benefit of using quad, in my opinion, is that you need less +/- Vcc lines and less coupling capacitors than 2 duals.

Most often I found that quads need more intricate layout, since more things must converge to the same spot. Regarding decoupling caps, I would often double the value for a quad than for a dual.
Indeed there are some cases where they make sense, such as quad comparators for a bargraph.

 

[Kingston]

The biggest benefit of using quad, in my opinion, is that you need less +/- Vcc lines and less coupling capacitors than 2 duals.

More decoupling is usually an advantage and just means better stability and actually more routing options that way. In SMD the additional cost of a few more x7r is negligible.

 

[user 37518]

Most often I found that quads need more intricate layout, since more things must converge to the same spot. Regarding decoupling caps, I would often double the value for a quad than for a dual.

That is true, however, in my opinion, having a lot of duals VS few quads, the latter is less cumbersome, I guess that to each his own.

 

[chilidawg]

That is true, however, in my opinion, having a lot of duals VS few quads, the latter is less cumbersome, I guess that to each his own.

I also prefer quads (MC33079 SMD version) for the same reason. Less supply routing-coupling, and also means less components to solder manually by hand, unless of course you have the extra buck for board manufacturing plus assembly, then yeah I suppose a couple more of X7Rs are ineligible  ;D